21143493522 has 18 divisors (see below), whose sum is σ = 45812239317. Its totient is φ = 7047625536.

The previous prime is 21143493499. The next prime is 21143493541. The reversal of 21143493522 is 22539434112.

21143493522 is a `hidden beast` number, since 2 + 1 + 1 + 43 + 4 + 93 + 522 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16604641881 + 4538851641 = 128859^2 + 67371^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102819.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 599778 + ... + 634050.

Almost surely, 2^21143493522 is an apocalyptic number.

21143493522 is an abundant number, since it is smaller than the sum of its proper divisors (24668745795).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143493522 is an frugal number, since it uses more digits than its factorization.

21143493522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68554 (or 34278 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The spelling of 21143493522 in words is "twenty-one billion, one hundred forty-three million, four hundred ninety-three thousand, five hundred twenty-two".